"What is said cannot be unsaid, and what is heard cannot be unheard."
说出口的话无法收回，听到的话无法忘记。
科学是人类智慧的结晶，是推动社会进步的重要力量。
If you find serenity and happiness，they may be jealous；Be happy anyway。People really need help but may attack you if you do help them。
一个组织的客户服务质量决定了其客户忠诚度的质量。
"A good book is an event in my life."
最简单的句子往往蕴含最深刻的真理。